According to Extension entomologists Tom A. Royer and Phil Mulder, reports have been received of Japanese beetles in double-crop soybeans. Adults are 1/2 inch-long, metallic green and bronze beetles. They have a row of five white tufts on the side of the body below the bronze wing covers and two white patches at the tip of the abdomen. The larvae (immature stages) are white grubs.
Adult Japanese beetles feed on more than 400 plant species. As they feed, they eat the green material on a leaf and leave the leaf veins behind, so the leaf resembles a lace-like leaf "skeleton." Soybeans can sustain substantial defoliation before they begin to suffer yield loss, which depends on the growth stage of the plants.
Several insecticides are registered for their control. All insecticides listed for blister beetle control are also registered for control of Japanese beetle and should be effective.
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